Nelson has been third- or fourth-choice behind Craig, Beevers and Byron Webster for most of the season, but he delivered two impressive performances at the Bescot Stadium and in the 1-0 victory at Spotland on Saturday when Lee Gregory scored the winner.

Romeo’s first two senior appearances for Millwall have resulted in two wins and two clean sheets.

But Harris also reminded fans dreaming of possible promotion that the priority this season was to create a club structure in which there was a clear pathway for players from the underage sides to the first team.

Harris’ defensive options will be boosted by the return from suspension of Beevers for the visit of Scunthorpe tomorrow night as Millwall look for a second home win of 2016.

“I have to give huge credit to a defence that thrives on wanting to keep clean sheets and a striker that’s bang form,” Harris said.

“That’s two clean sheets in the league, three in a row. We had no Mark Beevers for the last two games but he’s available and adds quality.

“I think we’ve seen the future.

“Let’s not forget, we’re pushing into a good position in the league, we’re on a real run, but we’re here for one reason – to get better as a club for the future. There are no promises or expectations this year, what’s expected is for us to grow with these players for the future with Sid and Mahlon putting in performances like they are.

“And if you take David (Forde) and Carlos off the bench it’s another homegrown, very young bench. So the positives for the long term are still really bright.

“Sid’s an aggressive character and he’s a young man that can be rushed at times on the pitch, but he’s a young man and he’ll learn as he gets older. He plays in a controlled manner, but shows his passion and desire to want to play for the club.”